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Combi Boiler Models

Combi boilers stand for combination boilers. They draw their water directly from the mains, this means that no hot or cold-water cylinder or storage tank is required. Combi boilers are the most popular type of boiler in the United Kingdom, which is no surprise when considering that they:

  1. Are small in comparison to a typical Boiler
  2. Are extremely efficient
  3. Have rapid access to hot water
  4. Are cost-effective

They deliver both hot water and heating to your home. They heat water on demand through the mains, so when you turn the hot tap your boiler gets going straight away. this is what makes them cost-effective because they only get going when you need them. On top of this, because the water is delivered directly from the mains it means that you can receive a powerful shower!

Because they don’t have a hot or cold-water cylinder or storage tanks, it makes them ideal for smaller homes, or building which don’t need to have multiple taps running at once.

Take a look at our combi boiler range below!

Worcester Greenstar CDi Classic Series

If you are looking for a combi boiler that is suitable for small or large properties with one or two bathrooms, then Greenstar CDi Compact would be a perfect choice.

Due to its compact size, it will fit in a standard kitchen cupboard giving a high output.

Key benefits of the Worcester Greenstar CDi Classic boiler:

  • User-friendly display designed for ease of use
  • Compact hence fits in a standard kitchen cupboard
  • Clear temperature display on easy-to-use knobs
  • Fine-tune the hot water according to your comfort
  • Get greater comfort and economy with a wide choice of controls
  • Frost protection
  • Instant hot water at any time of the day
  • Energy-efficient as uses low energy pump
  • Achieves an A+ ErP package efficiency rating for heating when installed with a smart Internet-connected Bosch Easy Control

Fitted from £1950 Inc. VAT.

Greenstar 29CDi Classic Greenstar 34CDi Classic Greenstar 38CDi Classic Greenstar 42CDi Classic
ErP Efficiency Rating – Water Heating A A A A
ErP Efficiency Rating – Space Heating A A A A
ErP Data Sheet ErP Data Sheet ErP Data Sheet ErP Data Sheet ErP Data Sheet
LPG model available Yes Yes Yes Yes
Wave Compatible Yes Yes Yes Yes
Solar Compatible No No No No
Control Options Yes Yes Yes Yes
Central heating output (kW) 29 34 38 42
Dimensions (mm) height x width x depth 760 x 440 x 360 760 x 440 x 360 760 x 440 x 360 760 x 440 x 360
Hot water flow rate 35°c ∆T (litres per minute) 12.3l/min 14.3l/min 16.4l/min 17.2l/min
Hot water flow rate 40°c ∆T (litres per minute) 11l/min 12l/min 14l/min 15l/min

Worcester Greenstar CDi Compact Series

The Worcester Greenstar CDi Compact combi boiler is suitable for small, medium and large-sized properties with one or two bathrooms.

This boiler is designed to fit within a standard kitchen cupboard. Despite its compact size, the high outputs make it suitable for homes with more than one bathroom.

Looking for a floor-standing combi boiler? Is so you should choose the Greenstar CDi Highflow. This is perfect for homes with more than two bathrooms. This boiler is known for its industry-leading hot water flow rates.

Key benefits of the Worcester Greenstar CDi Compact boiler:

  • User-friendly display designed for ease of use
  • Compact hence fits in a standard kitchen cupboard
  • Clear temperature display on easy-to-use knobs
  • Fine-tune the hot water according to your comfort
  • Get greater comfort and economy with a wide choice of controls
  • Frost protection
  • Instant hot water at any time of the day
  • Energy-efficient as uses low energy pump
  • Achieves an A+ ErP package efficiency rating for heating when installed with a smart Internet-connected Bosch Easy Control

Fitted from £1800 Inc. VAT

Greenstar 28CDi Compact Greenstar 32CDi Compact Greenstar 36CDi Compact
ErP Efficiency Rating – Water Heating A A A
ErP Efficiency Rating – Space Heating A A A
ErP Data Sheet ErP Data Sheet ErP Data Sheet ErP Data Sheet
LPG model available Yes Yes Yes
Wave Compatible Yes Yes Yes
Solar Compatible Yes Yes Yes
Control Options Yes Yes Yes
Central heating output (kW) 28 32 36
Dimensions (mm) height x width x depth 690 x 390 x 280 690 x 390 x 280 690 x 390 x 280
Hot water flow rate 35°c ∆T (litres per minute) 11.4l/min 13.1l/min 14.7l/min
Hot water flow rate 40°c ∆T (litres per minute) 10l/min 11.5l/min 12.9l/min

Worcester Greenstar Si Compact Series

This Boiler is also suitable for single bathroom homes, which are a small to medium size. It can fit in a kitchen cupboard and has user-friendly controls which are great for setting the perfect temperatures for your comfort.

Key benefits of the Worcester Greenstar Si Compact boiler:

  • Fits easily into a kitchen cupboard
  • Simple user-friendly displays
  • The water temperature can easily be adjusted
  • The range of many different controls means that you have a greater influence on overheating levels and costs
  • Frost protection which is typically installed in the garage or loft is included
  • Simple boiler controls with clear temperature display
  • It uses a low energy pump to reduce electrical usage
  • The hot water is provided directly from cold mains
  • A+ ErP package efficiency rating, when installed with a smart internet-connected Bosch Easy Control

Fitted from £1700 Inc. VAT

Greenstar 25Si Compact Greenstar 30Si Compact
ErP Efficiency Rating – Water Heating A A
ErP Efficiency Rating – Space Heating A A
ErP Data Sheet ErP Data Sheet ErP Data Sheet
LPG model available Yes Yes
Wave Compatible Yes Yes
Solar Compatible No No
Control Options Yes Yes
Central heating output (kW) 25 30
Dimensions (mm) height x width x depth 690 x 390 x 280 690 x 390 x 280
Hot water flow rate 35°c ∆T (litres per minute) 10.2l/min 12.3l/min
Hot water flow rate 40°c ∆T (litres per minute) 8.9l/min 10.7l/min

Worcester Greenstar I Series

The Worcester Greenstar i combi boiler is ectremely popular and perfect for small to medium sized homes with one bathroom.

This is one of the most popular boilers around. It’s made for homes on the smaller side, which only need capabilities for a single bathroom. It has its controls, which are easy to use so, you can adjust your heating with no issues.

On this boiler, we provide 12 years guarantee.

  • Easily displayed information with a user-friendly control system
  • Condensate discharge resilient to freezing up to -15’C* **
  • The range of many different controls means that you have a greater influence on overheating levels and costs
  • It uses a low energy pump to reduce electrical usage
  • The hot water is provided directly from cold mains
  • A+ ErP package efficiency rating, when installed with a smart internet-connected Bosch Easy Control

Fitted from £1600 Inc. VAT

Greenstar 25i Greenstar 30i
ErP Efficiency Rating – Water Heating A A
ErP Efficiency Rating – Space Heating A A
ErP Data Sheet ErP Data Sheet ErP Data Sheet
LPG model available Yes Yes
Wave Compatible Yes Yes
Solar Compatible No No
Control Options Yes Yes
Central heating output (kW) 25 30
Dimensions (mm) height x width x depth 710 x 400 x 330 710 x 400 x 330
Hot water flow rate 35°c ∆T (litres per minute) 10.2l/min 12.3l/min
Hot water flow rate 40°c ∆T (litres per minute) 9l/min 10.8l/min

Worcester Greenstar Highflow CDi Series

The Worcester Greenstar CDi Highflow is a well-established floor standing combi boiler that is renowned for industry-leading hot water flow rates.

Perfect for larger homes with two bathrooms.

Key benefits of the Worcester Greenstar Highflow CDi boiler:

  • Fits underneath a standard kitchen worktop
  • Larger two bathroom homes can be supplied by higher output options
  • Wide choice of controls enables greater comfort economy
  • Frost protection is included, reducing frost risk if installed in a garage or a cellar
  • Simple boiler control knobs with temperature display
  • Instantaneous hot water, always available

Fitted from £3000 Inc. VAT

Greenstar Highflow 440CDi Greenstar Highflow 550CDi
ErP Efficiency Rating – Water Heating A A
ErP Efficiency Rating – Space Heating A A
ErP Data Sheet ErP Data Sheet ErP Data Sheet
LPG model available Yes Yes
Wave Compatible Yes Yes
Solar Compatible No No
Control Options Yes Yes
Central heating output (kW) 29 30
Dimensions (mm) height x width x depth 850 x 600 x 600 850 x 600 x 600
Hot water flow rate 35°c ∆T (litres per minute) 20 @ 35°c ∆T 25 @ 35°c ∆T